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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70266e81dd6fb8a7531bb8ef49a35d68369d84f3241b1790d784f75d01ffdad4' 
  AND token = '1ZE5mIUyURdWkrivDoi9t8dDZbUpD0rQnhpaFUGrqFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}